434 _ Correspondence of J. Nickles. 
same class, may, under certain precautions, take place between those of 
different classes, and particularly from a bird to a mammal. The author 
has also studied the property, which the arterial blood has, of restoring, 
upon repeated injection, the irritability and contractility in parts that 
have lost them, after having been separated a certain time from the body. 
He has observed these two properties return to members of a dog, when 
they seemed extinct,—the members having already become rigid. 
Among the prizes relating to the arts hurtful to health, there is one for” 
the “Torrefacteur mécanique” of Eugene Rolland of Strasburg, which is 
used for the desiccation and torrefaction of tobacco, in the manufactories 
of Strasburg, Lyons and Paris. The torrefaction is made to take place 
without the usual escape of vapors, dust or essential.oils, and the number 
of workmen is reduced in the ratio of four to one. e material is ex- 
posed to a temperature regulated by a thermo-regulator, between limits 
not exceeding five or six degrees. The desiccation is perfectly uniform 
and is attended with almost no loss from burnt fragments or powder, 
The invention was honored with a great medal at the “ Universal Exposi- 
- 
Chemistry. The Jecker prize was divided between two chem : 
awarded. The sum of 12,000 francs might once have been ee 60 
Ss 
Prize in Physics—Induction Apparatus.—It is owing to a foundation 
r, de Trémont, 
contributes annually a sum of 1000 francs to “aid some savant without 
: : X- 
means in the expenses of experiments from which there 1s ert 
a i 
rit, whose works are well known and appreciated in and 
His reputation began with the construction of the Mellon a 
